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http://dx.doi.org/10.7837/kosomes.2019.25.6.687

Changes of Sedimentary Environment in the Tidal Flat of the Dammed Yeongsan River Estuary, Southwestern Coast of Korea  

Kim, Young-Gil (GeoSystem Research Corp.)
Lee, Myong Sun (Department of Marine Fisheries Resources, Mokpo National University)
Chang, Jin Ho (Department of Marine Fisheries Resources, Mokpo National University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.25, no.6, 2019 , pp. 687-697 More about this Journal
Abstract
By monitoring sediment grain size and level variation of tidal flat surface for 6 years (2005-2011), and also by mooring TISDOS (tidal-flat sediment dynamics observation system) on the low intertidal flat in 2008, we investigated the sedimentary environment of tidal flat in the dammed Yeongsan River Estuary. The tidal flat of the Yeongsan River Estuary lost 82 % of its area because of coastal development projects, and a narrow tidal flat below mean sea level now remains. Most of the tidal flat sediments are composed of silt up to 70-94 %, and show the characteristics of clay deficiency and silt dominance. This is closely related with the coastal development, which led to the destruction of high tidal flats where most mud settled, and the modification of tidal current patterns. Moreover, the estuarine tidal-flat sediments reveal seasonal variation. They are coarse with abundant silt during windy autumn to spring, fine with abundant clay during the less-windy and high-discharge summer. This phenomenon indicates that the behavior of sediment particles on the low intertidal flats of the Yeongsan River Estuary is influenced by wind waves for silt and fresh water discharge and the tidal process for clay. Monitoring results of the altitude of tidal flat surface showed that the study area had eroded at an average rate of -2.6 cm/y during the period of 2005-2011, and also that an unusual deposition with a rate of 4 cm/y occurred in 2010. The erosion can be explained by an increased tidal amplitude and a strengthened ebb-dominant tidal asymmetry after the construction of an estuary dike and the Yeongam Kumho Seawall. The deposition in 2010 seems to have been closely related to the mass production of suspended materials from dredging of the estuary.
Keywords
Yeongsan River Estuary; Estuarine tidal flat; Low intertidal flat; Silt; Tidal process; Erosion; Deposition; Dredging;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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